Abstract
THE extinction of visible radiation in a diffusing and absorbing substance such as ice or water is composed of absorption and scattering. An approximation connects the absorption, scattering and extinction coefficients (respectively given by ϰ, r and μ) by the relation 
Equation (1) can only be true for single scattering, in which process singly scattered light is effectively scattered out of the field of interest so that the effect is cumulative with absorption processes in contributing to the overall extinction. For media involving multiple scattering, light scattered out of the direction of interest can equally be returned to this field by subsequent scatterings. This implies that in general the extinction coefficient is restricted by the relation 
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References
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Weller, G. E., Nature, 221, 355 (1969).
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SCHWERDTFEGER, P. Absorption, Scattering and Extinction of Light in Ice and Snow. Nature 222, 378–379 (1969). https://doi.org/10.1038/222378a0
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DOI: https://doi.org/10.1038/222378a0
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